Antiglare device and method of making it



Feb. 5, P. V. SNOW v ANTIGLARE DEVICE AND METHOD OF MAKING IT FiledApril '7, 1930 1 270 7&720/2 Q /2014] 6y L GUI/ 4 jlarizeyi PatentedFeb. 5, 1935 v PATENT OFFICE ANTIGLARE DEVICE AND-METHOD OF MAKING ITPhilo Vernon Snow, Chicago, Ill. Application April (I, 1930, Serial No.442,058 4 Claims. (01. 91- 68) My invention relates to a filter orantiglare device. One object is the provision of means for shielding theeye of a user from bright light .or glare. Another object is theprovision of such a filter or shield which, although effective to shieldthe-eye of the user from bright lights or'glare, will still permit theuser to distinguish, through 1t, signal lights and the like, in-theirproper re-' lationship. Other objects will appear from time to time inthe course of the specification and claims. V 1

I illustrate my invention more or less diagramnatically in theaccompanying drawing, wherem- Figure 1 illustrates an elevation;

Figure 2 is a section on the line 22 of Figure n I Figure 3 is a sectionthrough the parts employed for the filter; and

Figure 4 is a section through the filter, with the parts assembled andpositioned.

Like parts are indicated by like symbols throughout the specificationand drawing.

A generally indicates a frame member passing across the front of avehicle, and A indicates any suitable windshield or window member forsuch a vehicle.

Secured to the member A I illustrate a base member B with a bracket orarm B forwardly projecting therefrom. B are any suitable securing means,such as screws. The member B is indicated as terminating with a hinge,eye B alinged with eyes B of the end of the pivoted link B B indicatesany suitable pivot or hinge member passing through the members B and BThe member B is longitudinally slotted as at B".

slidable along the member B is the block C. It may be clamped at anysuitable position therealong as by the nut C screwthreaded for lockingengagement with the bolt or screw C which passes through the slot B".The block C is apertured as at C slidable to receive the stem 0*. Crepresents any suitable thumb nut or locking member adapted to lock themember 0 against longitudinal movement through the aperture 0 Positionedat the lower end of the pin C is the yoke D having the downwardly turnedarms D Opposed to each such arm D is an ear D pro-.

jecting upwardly from the transverse member D D indicates any suitablebolts with the lock nuts D whereby the members D and D may be heldagainstrotation in relation to each other.

E indicates the filter member proper which is herein illustrated asbeing secured, along its up- E a coating of gelatin, glue or the like,indiper edge E bythe transverse member D It will be understood that themember E is transparent or translucent to a varying degree. I may forexample, have a zone E of substantially com plete transparency, formed,foreXampIe, of untinted glass or equivalent material. Beginning, forexample, along the general line, E I may employ coloring material orpigment or light obscur ing material of any suitable color or type, the

light obscuring or absorbing effect of which in- 10 I creasesprogressively upwardly toward the upper edge of the filter. I prefer toemploy a color, such as a shade of brown or a dull green which,'I havefound, permits the eye of the observer to distinguish the visual signalsordinarily used, such as red, green and amber lights, one purpose beingto reduce the strain upon the eye of the observer, when driving intobright lights, while avoiding the extremely undesirable result of makingit more dimcult for the observer to distinguish visual signals. I

As a means of forming such a filter I may employ two separate sheets ofglass, as shown in detail in Figures 3 and 4 and indicated as E E WhileI do not wish to be limited specifically in my filter or in my method ofmaking it, except so far as I limit myself specifically in my claims, Isuggest as a practical method of making such a. filter the provision ofan intermediate layer E, which may be of celluloid, bakelite, or somesub- 0 stance sufiiciently transparent for the purpose, while lessbrittle than glass. I may thenapply to either or both faces of themember E or to the inner face of either of the glass members E 35 catedin Figure 3 as E". This gelatin serves as means for precipitating thecoloring matter to be employed. It will be understood that while pref- 1erably I employ two sheets ofglass and an inter- 40 vening' sheet ofcelluloid, that nevertheless I may find'it practical, under somecircumstances to l omit the celluloid. Also I may apply the gelatin' andthe coloring matter to bothcelluloid and glass, or to glass alone, or tocelluloid alone. Whatever coloring matter or obscuring matter I mayemploy may be applied directly to the surfac of celluloid, bakelite, orglass, or may even be incorporated in the substance of the glass, eel-.-

afiected by the atmosphere. I may for example employ a manganesecompound, permanganate -of potash or some equivalent manganese com- 3that the time of exposure, or the volume of material employed vary,increasing upwardly from the line E. If the material is being flowed orwiped or brushed on, the treatment for the upper portion of the filtermay be kept up longer .than for the lower. For example a single evencoating might be put on, and subsequent coats may be applied, each suchcoat starting somewhat higher up on the filter. On the other hand, whendipping the member E, the upper edge E will be dipped more frequently inthe solution or left longerv in the solution than thelower edge, thearea below the line E not being treated at all, if clear glass isdesired throughout that area.

Referring to Figure 4, E indicates a thin layer of cement, whereby theglassmembers E and E? are bonded or cemented together about the innermember E The result is, in efiect, shatter proof glass. It will beunderstood, that whereas a surrounding layer of cement forms a readymeans for securing E E together, other means may be employed, such as asurrounding metallic frame, or such as pressing or cementing the memberstogether about or against the celluloid sheet E". It will be understoodthat while the employment of a lower band E of clear glass is apractical solution of the problem, I do not wish to be limited to anyspecific disposition of coloring matter, except so far as the specificlanguage of my claims sets out, and I wish the description and drawingto be taken as in a broad sense illustrative and diagrammatic ratherthan as limiting me to my specific showing.

The use and operation of my invention are as follows:

In employing the filter herein described I provide means, as shown inFigures 1 and 2, for adjustably positioning the filter forwardly of theeyes of the user. Assume that it is employed in an automobile. Themember E, when in use, may be positioned considerably closer to the eyeof the user, than the windshield, and is preferably positioned. at sucha level that the user, by tilting his neck or by raising or loweringhimself somewhat in his seat can raise his eyes in relation to themember E. When used for night driving a practical setting is to positionthe filter so that the driver will naturally and easily look vrea iesthrough the clear strip E If a car with bright lights approaches, theoperator rises slightly so that his eyes are aligned with the shadedarea E. The brighter the lights the higher will he lift his head, itbeing understood that the upper portion of the filter is sumcientlyopaque to permit the user to drive into very bright lights withoutannoyance. Taking another case, if the user is driving into brightsunlight, at sunrise or sunset, or into any constant light, he mayadjust the member E somewhat lower so that his eyes will at all timeslook through a relatively opaque portion of the filter.

It will be understood that whereas I have illustrated my filter asforming a separate panel mounted within the windshield, I consider itwithin the field of my invention and within the terms of my claims,unless specifically otherwise limited, that the filter may be mountedoutside the wind-shield, or mounted just within the windshield, althoughI have shown it as spaced laterally well within the wind-shield in theparticular embodiment illustrated as for example in Figure 2.

I claim:

1. The method of coloring a transparent body which comprises coatingsaid body with a color absorptive material, dipping the coated body intoa solution of a manganese compound, and causing said manganese compoundto be precipitated in said color absorptive material.

2. The method of coloring a transparent body, which comprises coatingsaid body with gelatin, dipping the gelatin coated body into a solutionof a manganese compound, and causing said manganese compound to beprecipitated in the gelatin coating.

' 3. The method of producing a colored ray filter which comprises.applying a coating of gelatin to a sheet of transparent material,dipping the gelatin coated sheet edgewise into a water solution of adye, and controlling the immersion by moving the sheet to cause theportion first entering the dye solution to remain in the solution asufiiciently longer time than the last inserted portion, whereby thegelatin coating will accept varying amounts of the dye, and whereby thecoloring applied to the gelatin will increase in density progressivelytoward said first entering portion.

4. The method of producing a colored ray filter which comprises applyinga coating of gelatin to a sheet of transparent material, dipping thegelatin coated sheet edgewise into a coloring solution, and controllingthe immersion to cause the first entering portion to remain in thesolution longer than the following portions, whereby the gelatin coatingwill accept varying amounts of the color, and whereby the coloringapplied to the gelatin will increase in density progressively from thelast portion dipped toward the first entering portion.

PHILO VERNON SNOW.

